This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A065894 #19 Apr 27 2024 03:36:09
%S A065894 0,5,74,831,8770,90407,921501,9335420,94238544,949152465,9544947488,
%T A065894 95881945186,962392087981,9653934463160,96795058249197,
%U A065894 970155429577330,9720761658966074,97376442842345766,975260045712259139,9765942332723655392,97779180397439081159
%N A065894 Number of composites <= 10^n.
%C A065894 Also, the order number of 10^n as a composite number.
%H A065894 Amiram Eldar, <a href="/A065894/b065894.txt">Table of n, a(n) for n = 0..29</a> (calculated using the b-file at A006880)
%F A065894 a(n) = 10^n - 1 - A006880(n). - _Max Alekseyev_, Aug 15 2013
%F A065894 For n>0, a(n) = A092871(n) + 1.
%e A065894 10 is the 5th composite number: 4, 6, 8, 9, 10.
%t A065894 Table[ 10^n- (PrimePi[10^n]) -1, {n, 1, 13} ]
%Y A065894 Cf. A002808, A006880, A092871.
%K A065894 nonn
%O A065894 0,2
%A A065894 _Labos Elemer_, Nov 28 2001
%E A065894 More terms from _Robert G. Wilson v_, Nov 29 2001
%E A065894 Formula and more terms from _Max Alekseyev_, Aug 15 2013